Janome hemmer foot cnp cat a the hemmer foot sometimes referred to as the rolled hemmer is used to stitch the narrow rolled hems usually found on shirt tails table linens and along the edge of frills the hemmer is designed with a scroll shaped feeder on top and a straight groove on the underside which determines the width of the finished hem the 4mm6mm hemmer feet are for medium to heavier fabrics a nice addition to the sewing box for janome front loaders category a